Boat-davit.



H. I'. NORTON.

BOAT DAVIT.

APPLICATION FILED NOV. 29, 1912.

Patented Sept. 2, 1913.

UNITED srA'rns 'PATENT OFFICE.

HAROLD FREDERICK NORTON, OF NEWPORT NEWS, VIRGINIA.

BOAT-Davila' Application filed November 29, 1912.

To all whom t may concern.'

Be it known that I, HAROLD F. NORTON, a citizen of the United States,residing at Newport News, in the county of Varwick and State ofVirginia, have invented certain new and useful Improvements in Boat-Davits, of which the following is a specification.

This invention comprises a davit and mechanism for operating it to lifta boat from the deck ot a vessel and swing it outboard into position tobe lowered into the water, of the general type shown and described in myprior U. S. Patent, No. 1,011,477, dated December 12, 1911.

As in the above-mentioned patent, the davit is operated byhand-mechanism comprising a non-revoluble member pivoted to the davitbetween its ends and a revoluble member journaled in a bearing of adeckstool; the non-revoluble member carrying a nut, and the revolublemember having a long screw entering the nut.

It has been found that where there is ri.- gidity of the operating partsagainst lateral and twisting movement of the davit, the screw and thenut into which it turns are sometimes subjected to cramping strains,when, for some reason, the davit-arm is moved or bends in directions atan angle to the arc of normal oscillation of the screw, or when thedavit-arm undergoes slight twisting from the torsional strains imposedupon it.

The object of the present invention is to provide stool and davitconnections for the operating screw and its nut, sufiiciently rigid, andyet of such construction as to eliminate strains upon said screw andnut, due to any perverse movement or twisting of the davit-arm.

The apparatus is shown in the accompanying drawing, in which- Figure 1is a side elevation of the davit and its operating mechanism; Fig. 2 isan end elevation of the same, viewed from inboard; Fig. 3 is an endelevation showing in detail the bearings of the operatingscrew, viewedfrom inboard; and Fig. 4t is a sectional side elevation of the operatingmembers, on a larger scale.

The apparatus illustrated comprises a davit arm 1 of channel steel,pivoted at its lower end 2 to the deck of the vessel at the gunwale, andhaving a curved and narrowed upper end 3, the tip of which is bent down-Specifcation of Letters Patent.

Patented Sept. 2,1 91 3.

Serial No. 734,106.

ward and has a hole Il to receive the hook of the fall-block. A cleat 5for the blockrope is secured to the lower end oi' the arm. A cylindricalpivot 6 is fixed to the davit arm toward its lower end, and upon this isswiv-eled the eye o't' a collar 7. This collar is provided with alateral extension 8 having a cross-bore 9 therethrough, adapted toreceive a pivot-pin 1t). The pivot-pin is engaged by the upper and lowerjournaleyes 11a ot' a yoke 11, which carries the tubular sheath 12 andthe integral nut 12, ot' the non-revoluble operating member. A cap 12b,within the yoke 11, closes the outboard end of the tubular member, toexclude water and dirt and retain a lubricant.

The nut 12 receives the long screw of the revoluble member 13, astop-nut llfybeing fixed on the inclosed end of the screw. A hand-crank13b is removably attached to the revolublc member at its outer end. Abushing 141 is fixed on the revoluble member 13 near its inboard end,heilig screwed thereon against a thrust-nut 15, and held againstaccidental displacement by a check-collar 1G. Upon the bushing 1li ismounted a collar 17, having oppOsitely-disposed pintles or trunnions 18,and suitable washers 17*l may be interposed between the bushing and thethrust-nut and the collar 17. A yoke- .member 19 and a cap-plate 20 areprovided with bearings 2l and 22, respectively, in which are journaledthe pintles 1S of the collar 17, washers 22fl being interposed, ifdesired. The yoke-member 19 is provided with rearwardly-extendingportions 23 and 24, having eyes adapted to register with the eyes 25 and26 of the steel bearing-pads 27 and to receive the bearing-pins 28(Figs. 1 and 3). The bearing-pads 27 are secured to a deck-stool 29.This stool is built of structural steel, and comprises a vertical member29a and an inclined member 29", seemed together at their upper ends andriveted at their lower ends to a channelbeam 30, inclosing a wood beam31 which is secured to the deck-sheathing 32. A. bracket 33 is securedto the channel-member 30 near the gunwale, and a bolt 34 serving as thepivot for the lower end of the davit extends through and is clamped inthe two wings of this bracket.

The operation ot' the device is similar to that otl my former patent,and is obvious. A pair of these davits and operating mechanisms isprovided for each boat, and require merely that two men, one at eachstool, ro:

tate the revolubleimembers.Hby means of the.

is made for universal movement whioh'will erew, one`='member bei-ngnon-r`evolub1e y20 li-reetly L"swiveledlto s'aiclt-davit intermediateits rends?, the other memberV bei-ng reizorliible, fand!"all"iXeclff-'deekstoollflravingvf a :bearing 'ffswiveleclffortiniversalzrvm-ovementinf which saidf revolttble memberLisi'thr-ustejournalefl,

f "its-outer :enel extending throu-gli'- the .bearing` '1* and`provieleclwith-means for effecting: rot zrl :l-tion.

QSLAHd-avitsupporteclfabys a lpivot iat -lower end-,1f'and'smeansfforoscillating 1 said i=clavt comprising ftwo substantiallyAhorizon J1'-f-tal==members=conneoted by :nutf-f'and Along vvserew,4one:member-'-being non'erevol-uble'anl iclireetly :swrvel'ecl forfu'm-versal movement -tosaicl2el1avit interm'ecli'atekits:ends, theVother 351 member'being"revoluble; anclfy avixed deck- Yl-'sto'o'lhaving aebearinglswiveled for univer..-

:salxmovemen't: lin which-@said revoluble fm'emQ- v fibeivfis. thrust-journaledi; its :outer-z enell extend'- -wing throiightlie bearing. :andhavingzmean's 4Q+gfor 'eeoting rotation. .SjaAa :clavit: supported by?vpivot zat vl ifs talff-members 1connected Lby a inut andfnlong rserewf:saiclrfmrembers :being ipivoted,= one: :t0nA

.the acl'avit'T zand; :the 'other'V lto,.tlie fcleckL-stool, t-'he'y:revoluble .member thrustfzj ournalfedrin: a -v @bearing 'swivelecl foruniversal ',movement.

lower end, and means for oscillating sail rclavittcomprising twosubstantially horizontal members connected by a nut and long serew, onemember being non-revoluble and directly swivelecl for universal movement.teesaidrlavit intermediate its enclsrthe other VAprovided"witha'swiveled bearing, said revol'uble member being thrust-journaleol insaid swiveled bearing and extendingthroughsthe bearing and'l iprovideclrwith means for efufloweirendr, a iixed deCIrLStOLLand, .means for.`foscfillatmg.. said-Jl davit comprlsmg ftwo Ysub- :staintlally:horizontal members,l f one .of t which is revoluble and the othernon-revoluble, f eonneoted to eachother 'by avznut and long oscillatingsaid Jcla-vit comprising :two 1 .substantially horizontal members,': one:of 'which is 'f'revoluble fand' lthe iother". non'vrevolnble7 vinspresence of .two witnesses. v vHAROLDnummer NoRToN v f zllVitnesses: Y

GILBERT.: 13.? :MoALP-INE,

member being revoluble, a iiXecl deck-stoolV connected to teach'voth'erfby a nutvancl Jlong' "screw, "saidian'embersffbemg1 plvotecl;oner t0; ,if

In .testimony whereof I alfixfmyasignature ""Gpiestof" this patnt'ma'ybbtaied'for'vecents each, by addressing the Commissioner of Patents. i

"""iW'ashiIl'gton ILC.

